ABB Relion 670 Series Applications Manual page 411

1MRK 511 358-UUS A
IEC09000310 V1 EN-US
Figure 196: Example designation, serial execution number and cycle time for logic function
The execution of different function blocks within the same cycle is determined by the order of
their serial execution numbers. Always remember this when connecting two or more logical
function blocks in series.
15.7 Fixed signal function block FXDSIGN
15.7.1 Identification
Function description
Fixed signals
15.7.2 Application
The Fixed signals function FXDSIGN generates nine pre-set (fixed) signals that can be used in the
configuration of an IED, either for forcing the unused inputs in other function blocks to a certain
level/value, or for creating certain logic. Boolean, integer, floating point, string types of signals are
available.
One FXDSIGN function block is included in all IEDs.
Application manual
that also propagates timestamp and quality of input signals
Always be careful when connecting function blocks with a fast cycle time to
function blocks with a slow cycle time.
Remember to design the logic circuits carefully and always check the execution
sequence for different functions. In other cases, additional time delays must be
introduced into the logic schemes to prevent errors, for example, race between
functions.
IEC 61850
identification
FXDSIGN
IEC09000310-1-en.vsd
IEC 60617
identification
-
ANSI/IEEE C37.2
device number
-
Section 15
Logic
IP15080-1 v2
SEMOD167904-2 v2
M15322-3 v11
405